[ovs-discuss] lost packet on port channel

yedc yedongcan at awcloud.com
Thu Jul 22 03:08:50 UTC 2021

Hi OVS-team,

We had just met a problem in our customer environments, the ovs-vswitchd log appears in everyday like this:
WARN|system at ovs-system: lost packet on port channel 5 of handler 8

OVS version: 
# ovs-vsctl --version
ovs-vsctl (Open vSwitch) 2.9.0
DB Schema 7.15.1

From the ovs-dpctl show command, all the port channel is Linux bond bridged in OVS as our tenant network in OpenStack product.

From the ovs-vswitchd log, we searched the OVS code, it seems the netlink socket receive buffer overflowed:

We noticed that the value had changed to 1024kB * 1024kB (1MB) in version v1.4:

From the mail list, there is a method using hping3 to generated lots of new flows per second:

I try it in out test environment, but not see the previous warnning log.
Can someone provides more detail method of using hping3 try to reproduce the problem in the ovs-vswitchd log?


More information about the discuss mailing list